Add bump-version script to keep release version refs in sync

[danieljohnmorris]

Summary

Caught while loading project context: AGENTS.md still said 0.8.0 and .claude-plugin/plugin.json was at 0.8.0 even though Cargo.toml is at 0.10.3. The release process documented only step 1 as 'bump version in Cargo.toml', so every release since 0.8 has drifted these.

Fixes the drift and prevents recurrence by adding scripts/bump-version.sh X.Y.Z that rewrites the version in:

• Cargo.toml
• AGENTS.md (the "Current version: **X.Y.Z**" line)
• .claude-plugin/plugin.json
• .claude-plugin/marketplace.json

Then runs cargo update -p ilo --precise X.Y.Z to refresh Cargo.lock. npm/ and pi/ are already bumped from the git tag by CI, so they don't need to be in the script.

AGENTS.md release-process step 1 now calls the script instead of pointing at Cargo.toml alone.

What's in the diff

Commit 1 - add scripts/bump-version.sh to keep release version refs in sync

• scripts/bump-version.sh: awk-based line replacement (line-based JSON edit to avoid reflowing keys or escaping unicode). Validates X.Y.Z shape, refuses to run outside the repo root, warns if cargo update fails before falling back to cargo check.
• tests/bump_version_script.rs: runs the script with a 9.99.99 sentinel against the live working-tree files, asserts the sentinel landed in every target, uses a Drop guard to restore the four targets plus Cargo.lock so a panic never leaks the sentinel. Second test asserts bad input is rejected.
• AGENTS.md: release-process step 1 now calls the script.

Commit 2 - sync stale version refs to 0.10.3

• Ran the new script with 0.10.3 to bring the four files in line. Also adds a trailing newline to both JSON files.

Repro

Before:

```
$ grep -nE '"version"|Current version' Cargo.toml AGENTS.md .claude-plugin/*.json
Cargo.toml:3:version = "0.10.3"
AGENTS.md:7:- Current version: 0.8.0 ...
.claude-plugin/marketplace.json:13: "version": "0.10.3",
.claude-plugin/plugin.json:4: "version": "0.8.0",
```

After: all four read 0.10.3. Running scripts/bump-version.sh 0.11.0 would move all four (and Cargo.lock) to 0.11.0 in one command.

Test plan

• `cargo test --test bump_version_script` (both new tests pass)
• `cargo test --release --features cranelift` (full suite: 67 test binaries, all green)
• `cargo fmt --check`
• `cargo clippy --tests --features cranelift -- -D warnings`
• Manual: ran the script with a sentinel, confirmed only the four targets diff, confirmed restore-on-panic by deliberately breaking the assert during dev

Follow-ups

None.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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